她曾在地球清洁日组织整个高年级班级帮助低年级打扫操场。

She used the whole senior class to help the lower school clean up the playground on Earth Day.

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所加入程序码看起来会像下列范例所示，快照集类别的部分是设计来回答“哪些学生在高年级班级？”的查询。

The addition might look something like the following example, part of a snapshot class designed to answer the query "Which students are in the senior class?"

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所有班级的当地教师来自三个等级，小学低年级(1 ~ 3年级)，小学高年级(4 ~ 6年级)以及中学。

Teacher attended could be divided into three groups: low grade in primary school (grade 1 ~ 3), high grade in primary school (grade 4 ~ 6) and middle school.

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